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윤순동 해양환경안전학회 2002 해양환경안전학회지 Vol.8 No.2
Ship operators use anchor dredging for the collision avoidance or safety of ship handling in a harbour or narrow channel. This paper clarifies the technique of the anchor dredging known as a common sense for. the seafarers A mathematical model at low speed range is established for the estimation of ship motion under the assumed environment, simulate the advance speed , and turning ability under the anchor dredging or not. The results shows good agreement with the conventional seamanship and their experiences as follows. Ahead speed used the anchor dredging is slower(speed reduction ratio:40%) than the normal ahead speed and the stopping distance is shorter (distance reduction ratio:40%)than the normal ahead distance without the anchor dredging.. Turning speed used anchor dredging is slower(speed reduction ratio:72%)than the normal ahead speed and the tactical diameter is shorter(distance reduction ratio:24%)than the diameter by the normal turning without the anchor dredging.
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교정용 미니 임플랜트의 cutting flute의 길이 및 형태에 따른 식립 및 제거 토크의 비교
윤순동,임성훈 대한치과교정학회 2009 대한치과교정학회지 Vol.39 No.2
Objective: The purpose of this study was to evaluate the effect of length and shape of cutting flute on mechanical properties of orthodontic mini-implants. Methods: Three types of mini-implants with different flute patterns (Type A with 2.6 mm long flute, Type B with 3.9 mm long and straight flute, Type C with 3.9 mm long and helical flute) were inserted into the biomechanical test blocks (Sawbones Inc., USA) with 2 mm and 4 mm cortical bone thicknesses to test insertion and removal torque. Results: In 4 mm cortical bone thickness, Type C mini-implants showed highest maximum insertion torque, then Type A and Type B in order. Type C also showed shortest total insertion time and highest maximum removal torque, but Type A and B didn't showed statistically significant difference in insertion time and removal torque. In 2 mm cortical bone thickness, there were no significant difference in total insertion time and maximum removal torque in three types of mini-implants, but maximum insertion torque of Type A was higher than two other Types of mini-implants. Conclusions: Consideration about length and shape of cutting flute of mini-implant is also required when the placement site has thick cortical bone. 본 연구는 self-tapping screw의 특징적 구조인 cutting flute의 길이 및 형태 변화에 따른 미니 임플랜트의 식립 및 제거 토크를 비교해보기 위해 시행되었다. 외경, 내경, 길이 및 pitch 등 다른 조건이 모두 동일하고 cutting flute의 형태만 다른 세 종류의 미니 임플랜트를 사용하였다(A군; 2.6 mm 길이의 flute가 형성된 그룹, B군; 3.9 mm의 길이이면서 직선형의 flute를 갖는 그룹, C군; 3.9 mm의 길이이면서 나선형의 flute를 갖는 그룹). 골밀도를 균일하게 하기 위해 실험용 인공골(Sawbones Inc., USA)을 사용하였으며, 수직력 및 회전속도를 일정하게 하기 위해 구동식 토크 시험기를 이용하였다. 그 결과 다음과 같은 결론을 얻었다. 총 삽입 시간은 2 mm 두께의 피질골 시편에서는 세 군간에 차이를 보이지 않으나, 4 mm 두께의 피질골 시편에서는 C군 > B군 > A군 순으로 짧은 삽입 시간을 보였다. 최대 삽입 토크는 2 mm 두께의 시편에서는 A군이 다른 두 군에 비해 높은 값을 보이나, 4 mm 두께의 피질골 시편에서는 C군 > A군 > B군 순으로 높은 값을 보였다. 최대 제거 토크는 2 mm 두께의 피질골 시편에서는 세 군 사이에 차이가 없으나, 4 mm 두께의 피질골 시편에서는 C군이 다른 두 군에 비해 높은 값을 보여주었다. 이상의 결과로 보아 피질골이 두꺼운 부위에 미니 임플랜트를 식립할 경우 cutting flute의 길이 및 형태 또한 고려하여 미니 임플랜트를 선택하는 것이 바람직하다.
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윤순동 木浦海洋大學校 2003 論文集 Vol.11 No.-
We require various kinds of Leisure culture due to holiday increase. The marine leisure as a mass culture is useful for the people who want to enjoy on seashore. The author suggested the subject of marine leisure development. The results obtained through the investigation were as follows; The necessity of the subject was in remarkable agreement with the view of the participant. The view of the item converted was comparative few (about 7 %). The participant required a thorough class management for the subject completion effectiveness.
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고재용,윤순동 木浦海洋大學校 1995 論文集 Vol.3 No.1
High Tensile Steel enables to reduce the plate thickness comparing to the case when Mild Steel is used. From the economical view points, this is very preferable, since the reduction in the hull weight. However, to use the High Tensile Steel effectively, the plate thickness may become thin so that the occurrence of buckling is inevitable and design allowing plate buckling may be necessary. If the in plane stiffness of the plating decreases due to buckling, the flexural rigidity of the cross section of a ship's hull also decreases. This may lead to excessive deflection of the hull girder under longitudinal bending. In these cases a precise estimation of plate's behavior after buckling is necessary, and nonlinear analysis of isolated and stiffened plates is required for structural system analysis. In this connection, this paper discusses nonlinear behaviour of thin plate under thrust. Based on the analytical method, elastic large deflection analysis of isolated plate is perform and simple expression are derived to evaluate the in plane rigidity of plates subjected to uniaxial compression.
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고재용,윤순동 木浦海洋大學校 1999 論文集 Vol.7 No.2
Recently recession has made small and medium sized businesses have hard times in Korea. Job opportunities for university is graduates have lessed sharply. In study we try to investigate what causes the present economic crisis in Korea first and than suggest solutions. We limit our study to the ship-building yards in southwest area in Korea, where our university is located. The question-and-answer method is taken. Then, what is the cause of the difficulties of ship-building industries, that is, the lack of enough workforce due to the unpopularity of 3D jobs, financial problems, poor technology, and the decrease of new ship-building contracts? What do ship-building businesses need urgently? Where should they find their ways out? We propose how they have to manage to develop the businesses in the future. It is based on the analysis and statics of question-and-answer date obtained by visiting ship-building industries, Our alternative is a kind available at once, rather then typical technological development and productivity improvement. Finally, we conclude that if people engaging in the ship-building yards participate in reforms, IMF will surely give us an another chance of achieving economic boom in Korea.
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